diff --git a/src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementChain.java b/src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementChain.java
index 5bc55cd8..819990fd 100644
--- a/src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementChain.java
+++ b/src/main/java/com/gtnewhorizon/structurelib/structure/IStructureElementChain.java
@@ -62,7 +62,8 @@ default BlocksToPlace getBlocksToPlace(T t, World world, int x, int y, int z, It
             if (e == null) continue;
             if (predicate == null) predicate = e.getPredicate();
             else predicate = predicate.or(e.getPredicate());
-            is.add(e.getStacks());
+            Iterable<ItemStack> stacks = e.getStacks();
+            if (stacks != null) is.add(stacks);
         }
         if (predicate == null) return null;
         return new BlocksToPlace(predicate, Iterables.concat(is));